Blockage detection system of nozzle structure disc type centrifugal machine

Abstract

The invention discloses a blockage detection system for a nozzle structure disc type centrifugal machine. The blockage detection system comprises a rotary drum shell, a connector base, a feeding connector, a discharging connector and a slag discharging pipe. A feeding core pipe connected to the interior of the rotary drum is arranged in the connector base in a penetrating mode, a feeding connector is formed in the upper end of the feeding core pipe, a discharging connector is formed in one side of the connector base, and a slag discharging pipe is arranged on the lower portion of the rotary drum shell; a feeding pipe is connected to the feeding connector, a discharging pipe is connected to the discharging connector, a material inlet flow meter is arranged on the feeding pipe, and a material outlet flow meter is arranged on the discharging pipe. According to the material blocking detection system for the disc type centrifugal machine, the flow meters are designed at the material inlet and the clear liquid outlet, the material blocking condition of the nozzle structure disc type centrifugal machine is judged by comparing the flow values of the two flow meters, and the material blocking detection system can be used for calculating the concentration effect. In the application of actual production, the blockage condition of the butterfly centrifugal machine can be prevented, so that irreversible loss caused by unbalance of the rotary drum is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of disc-type centrifuges, and in particular to a material blocking detection system for a disc-type centrifuge with a nozzle structure. Background Art

[0002] Disc stack centrifuge is a fluid mechanical equipment that utilizes immiscible mixtures of different densities to generate different centrifugal forces in the centrifuge to achieve physical separation of materials. The drum speed can be as high as 10,000 r / min or more, and the drum diameter range can be as high as 1,000 mm or more. Therefore, it has a high separation factor and large production capacity. It can handle highly dispersed liquid-liquid two-phase emulsions and liquid-solid two-phase suspensions with very low solid phase sedimentation velocity that are difficult to effectively separate by general centrifuges. It is widely used in chemical, pharmaceutical, petroleum, transportation, food, light industry, bioengineering and other industries. There are many types of disc centrifuges. According to the slag discharge method, they can be divided into manual slag discharge type, piston slag discharge type and nozzle slag discharge type. The disc centrifuge drum of the nozzle structure is conical in shape to increase the volume of sediment storage and facilitate the discharge of sediment. During the working process, the slag is continuously discharged through the nozzle to concentrate the suspension. The concentration rate is 5-30 times. In order to improve the concentration rate, part of the sediment can be recycled. This type of machine is suitable for emulsion separation and solid phase concentration with a solid phase concentration of ≤10%. Generally speaking, the nozzle for the light phase is located near the center of the drum, while the nozzle for the heavy phase is close to the edge of the drum. The number is 4-12 and is evenly distributed on the circumference. The sediment discharged through the nozzle, its production capacity and separation quality are related to the number of nozzles, aperture, drum rotation speed, equivalent sedimentation area of ​​the disc and other factors. The nozzle hole is small, and the concentration of the discharged sediment can be increased, but the small aperture is easy to cause large particles in the sediment to block, causing the drum to be unbalanced and produce strong vibration. The larger the nozzle hole, the worse the concentration effect of the sediment, affecting the separation quality. Therefore, it is necessary to select the appropriate number and diameter of nozzles. However, in actual production, blockage should be prevented in advance to avoid the unbalance of the drum and cause irreversible losses. However, there is currently no good technical means to predict the blockage of the nozzle structure disc centrifuge.

[0003] In view of the above, it is necessary to propose a nozzle structure disc centrifuge blockage detection system to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects in the prior art and provide a nozzle structure disc type centrifuge blockage detection system.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a nozzle structure disc centrifuge blockage detection system, comprising a drum shell, a joint seat, a feed interface, a discharge interface, and a slag discharge pipe; a joint seat is provided at the upper end of the drum shell, a feed core tube connected to the inside of the drum is penetrated through the joint seat, a feed interface is formed at the upper end of the feed core tube, a discharge interface is provided on one side of the joint seat, and a slag discharge pipe is provided at the lower part of the drum shell; a feed pipe is connected to the feed interface, a discharge pipe is connected to the discharge interface, a material inlet flow meter is provided on the feed pipe, and a material outlet flow meter is provided on the discharge pipe.

[0006] Furthermore, the feed pipe is provided with a material branch pipe and a cleaning water inlet branch pipe, the material branch pipe is connected to the material raw liquid, and the cleaning water inlet branch pipe is connected to the cleaning water.

[0007] Furthermore, the discharge pipe is connected with a clear liquid branch pipe and a cleaning water outlet branch pipe, the clear liquid branch pipe is connected to the clear liquid outlet, and the cleaning water outlet branch pipe is connected to the cleaning water outlet.

[0008] Furthermore, the material branch pipe, the cleaning water inlet branch pipe, the clear liquid branch pipe, and the cleaning water outlet branch pipe are all provided with control valves for pipeline switching.

[0009] A method for detecting blockage of a nozzle structure disc centrifuge, collecting material inlet flow meter data to obtain material feed flow, collecting material outlet flow meter data to obtain clear liquid flow discharged from the centrifuge, calculating the difference between the real-time collected material feed flow and clear liquid flow as the real-time flow difference, and comparing the real-time flow difference with the normal flow difference for judgment.

[0010] Furthermore, when the real-time flow rate of the clear liquid increases, the real-time flow difference decreases, and when the real-time flow difference is smaller than the normal flow difference, it is determined that the nozzle is clogged.

[0011] Furthermore, if the calculated real-time flow difference is equal to the normal flow difference, the nozzle is judged to be normal.

[0012] A method for calculating the concentration multiple of a nozzle structure disc centrifuge comprises the following steps: S1: Determine the concentrate outlet flow rate: Q 浓缩 =Q 进料 −Q 清液 Where: Q 浓缩 —Concentrate outlet flow rate; Q 进料 —Material feed flow rate; Q 清液 — Clear liquid flow rate; S2: Determine the mass flow rate of a component in the stock solution: M 进料 =Q进料 ×C 进料 Where: M 进料 —Mass flow rate of a component in the feed stock solution; Q 进料 —Material feed flow rate; C 进料 — concentration of a component; S3: Determine the mass flow rate of a component in the concentrate: M 浓缩 =Q 浓缩 ×C 浓缩 Where: M 浓缩 —Mass flow rate of a component in the concentrate; Q 浓缩 —Concentrate outlet flow rate; C 浓缩 — the concentration of an ingredient in a concentrate; S4: Due to material balance, the mass flow rate of a component in the raw liquid is equal to the mass flow rate of a component in the concentrate: M 浓缩 = M 进料 To find out the concentration of a component in a concentrate: S5: Calculate the concentration factor: Where: C 浓缩 —Concentration of an ingredient in a concentrate; C 进料 —The concentration of a component.

[0013] The advantages and beneficial effects of the present invention are as follows: the present invention is a nozzle structure disc centrifuge blockage detection system, flow meters are designed at the material inlet and the clear liquid outlet, and the blockage situation of the nozzle structure disc centrifuge is judged by comparing the flow values ​​of the two flow meters, and can be used to calculate the concentration effect. In actual production applications, the blockage of the butterfly centrifuge can be prevented, thereby avoiding irreversible losses caused by the imbalance of the drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a nozzle structure disc type centrifuge blockage detection system of the present invention; In the figure: 1. Drum shell; 2. Joint seat; 3. Feed interface; 4. Discharge interface; 5. Slag discharge pipe; 6. Feed core pipe; 8. Material inlet flow meter; 9. Material outlet flow meter; 10. Material branch pipe; 11. Cleaning water inlet branch pipe; 12. Material raw liquid; 13. Cleaning water; 14. Clear liquid branch pipe; 15. Cleaning water outlet branch pipe; 16. Clear liquid outlet; 17. Cleaning water outlet; 18. Control valve. DETAILED DESCRIPTION

[0015] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0016] Embodiment 1: A nozzle structure disc centrifuge blockage detection system, such as Figure 1 As shown, it includes a drum shell 1, a joint seat 2, a feed interface 3, a discharge interface 4, and a slag discharge pipe 5; the upper end of the drum shell 1 is provided with a joint seat 2, and a feed core pipe 6 connected to the inside of the drum is penetrated in the joint seat 2, and the upper end of the feed core pipe 6 forms a feed interface 3, and a discharge interface 4 is provided on one side of the joint seat 2, and a slag discharge pipe 5 is provided at the lower part of the drum shell 1; the feed interface 3 is connected to a feed pipe, and the discharge interface 4 is connected to a discharge pipe, and the feed pipe is provided with a material inlet flowmeter 8, and the discharge pipe is provided with a material outlet flowmeter 9. The flow rate of the raw material solution 12 entering is detected by the material inlet flowmeter 8; the flow rate of the clear liquid flowing out is detected by the material outlet flowmeter 9.

[0017] Specifically, the feed pipe is provided with a material branch pipe 10 and a wash water 13 inlet branch pipe 11, the material branch pipe 10 is connected to the material raw liquid 12, and the wash water 13 inlet branch pipe 11 is connected to the wash water 13. The discharge pipe is connected with a clear liquid branch pipe 14 and a wash water 13 outlet branch pipe, the clear liquid branch pipe 14 is connected to the clear liquid outlet 16, and the wash water 13 outlet branch pipe is connected to the wash water 13 outlet. The material branch pipe 10, the wash water 13 inlet branch pipe 11, the clear liquid branch pipe 14, and the wash water 13 outlet branch pipe are all provided with a control valve 18 for pipeline switching. In this embodiment, the material pipeline can be switched to the cleaning pipeline by switching the control valve 18. For example, when blockage occurs in the drum, the cleaning water 13 can be opened and enter the drum from the feed interface 3. The cleaning water 13 can flush the inside of the drum and clean the pipeline of heavy materials when flowing out from the slag discharge pipe 5; the cleaning water 13 can also clean the pipeline of light materials.

[0018] The working principle of the present invention is: the flow rate of the material entering the centrifuge can be obtained through the material feed flow meter, and the clear liquid flow rate of the clear liquid outlet 16 can be obtained through the clear liquid outlet 16 flow meter. By comparing the two flow values, if the difference between the two flow rates is consistent with the nozzle concentration multiple and the aperture selection (the aperture and concentration multiple of the nozzle are determined according to the process requirements during design, and they determine the flow rate and concentration of the concentrate), that is, the measured flow value is consistent with the nozzle aperture concentration multiple, indicating that the nozzle is not blocked. If the clear liquid outlet 16 flow rate is greater than the flow value when the nozzle is not blocked, it can be concluded that the nozzle in the centrifuge drum is blocked, avoiding serious blockage causing the drum to be unbalanced, thereby causing severe vibration of the whole machine and damaging the equipment. By comparing the material inlet flow value with the clear liquid outlet 16 flow value, the material concentration multiple can be obtained.

[0019] Embodiment 2: A method for detecting blockage of a nozzle structure disc centrifuge, collecting data from a material inlet flow meter 8 to obtain a material feed flow rate, collecting data from a material outlet flow meter 9 to obtain a clear liquid flow rate discharged from the centrifuge, calculating the difference between the real-time collected material feed flow rate and the clear liquid flow rate as a real-time flow difference, and comparing the real-time flow difference with the normal flow difference for judgment.

[0020] Furthermore, when the real-time flow rate of the clear liquid increases, the real-time flow difference decreases, and when the real-time flow difference is smaller than the normal flow difference, it is determined that the nozzle is clogged.

[0021] Furthermore, if the calculated real-time flow difference is equal to the normal flow difference, the nozzle is judged to be normal.

[0022] Specifically, the data of a disc centrifuge used to separate oil-water mixture under normal conditions: Feed flow rate: 100 L / min Oil phase concentration of stock solution: 5% (mass fraction) Clear liquid outlet flow rate: 90 L / min Concentrate outlet flow rate: 10 L / min Concentrate oil phase concentration: 50% (mass fraction) Nozzle aperture: 1 mm Calculation steps: 1. Determine the mass flow rate of the oil phase in the stock solution: Oil phase mass flow rate in stock solution = feed flow rate × stock solution oil phase concentration Oil phase mass flow rate in stock solution = 100 L / min × 0.05 = 5 kg / min 2. Determine the mass flow rate of the oil phase in the concentrate: Oil phase mass flow rate in concentrate = concentrate flow rate × concentrate oil phase concentration Oil phase mass flow rate in concentrate = 10 L / min × 0.50 = 5 kg / min 3. Calculate the concentration multiple: Concentration multiple = oil phase concentration in concentrate / oil phase concentration in stock solution Concentration multiple = 50% / 5% = 10 4. Verify traffic balance: Feed flow = clear liquid outlet flow + concentrate outlet flow 100 L / min=90 L / min+10 L / min Determine whether the nozzle is clogged Assume that at a certain moment, the measured data is as follows: Clear liquid outlet flow rate: 95 L / min Concentrate outlet flow rate: 5 L / min 1. Recalculate the concentration multiple: Oil phase mass flow rate in concentrate = concentrate flow rate × concentrate oil phase concentration Oil phase mass flow rate in concentrate = 5 L / min × 0.50 = 2.5 kg / min 2. Verify traffic balance: Feed flow = clear liquid outlet flow + concentrate outlet flow 100 L / min=95 L / min+5 L / min Determine whether the nozzle is clogged: Clear liquid outlet flow rate: 95 L / min, greater than 90 L / min under normal circumstances.

[0023] Concentrate outlet flow rate: 5 L / min, less than 10 L / min under normal circumstances.

[0024] Since the clear liquid outlet flow rate is greater than the normal flow rate value, it means that the nozzle may be clogged, resulting in a decrease in the concentrate outlet flow rate.

[0025] The difference between the material feed flow rate and the clear liquid outlet flow rate: Under normal circumstances, this difference should be 10 L / min (100 L / min - 90 L / min).

[0026] Nozzle concentration multiple and aperture selection: The aperture and concentration multiple of the nozzle are determined during design to ensure that the flow rate of the concentrate is 10 L / min and the concentration multiple is 10.

[0027] By comparing the actual measured clear liquid outlet flow rate with the flow rate value under normal conditions, it can be determined whether the nozzle is clogged. In this example, the clear liquid outlet flow rate is 95 L / min, which is greater than the normal 90 L / min, while the concentrate outlet flow rate is 5 L / min, which is less than the normal 10 L / min. This indicates that the nozzle may be clogged and needs to be checked and cleaned.

[0028] Embodiment three: A method for calculating the concentration multiple of a nozzle structure disc centrifuge. Specifically, the implementation data of a disc centrifuge used to separate oil-water mixtures: Feed flow rate: Q 进料 =100 L / min Oil phase concentration of stock solution: C 进料 =5% (mass fraction) Clear liquid outlet flow rate: Q 清液 =90 L / min Calculation steps 1. Determine the concentrate outlet flow rate: Q 浓缩 =Q 进料 −Q 清液 =100 L / min−90 L / min=10 L / min 2. Determine the mass flow rate of the oil phase in the stock solution: M 进料 =Q 进料 ×C 进料 M 进料 =100 L / min×0.05=5 kg / min 3. Determine the mass flow rate of the oil phase in the concentrate: M 浓缩 = M 进料 =5 kg / min 4. Determine the oil phase concentration in the concentrate: C 浓缩 = = 0.50 or 50% 5. Calculate the concentration multiple: Concentration multiple = = =10 Through the above calculation, we get a concentration factor of 10. This means that the oil phase concentration in the concentrate discharged through the nozzle is 10 times that of the oil phase in the original solution.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A nozzle structure disc centrifuge blockage detection system, comprising a drum shell, a joint seat, a feed interface, a discharge interface, and a slag discharge pipe; the upper end of the drum shell is provided with a joint seat, a feed core tube connected to the inside of the drum is penetrated through the joint seat, the upper end of the feed core tube forms a feed interface, a discharge interface is provided on one side of the joint seat, and a slag discharge pipe is provided at the lower part of the drum shell; characterized in that, The feed interface is connected with a feed pipe, the discharge interface is connected with a discharge pipe, the feed pipe is provided with a material inlet flow meter, and the discharge pipe is provided with a material outlet flow meter.

2. A nozzle structure disc centrifuge blockage detection system according to claim 1, characterized in that: The feed pipe is provided with a material branch pipe and a cleaning water inlet branch pipe, the material branch pipe is connected to the material raw liquid, and the cleaning water inlet branch pipe is connected to the cleaning water.

3. A nozzle structure disc centrifuge blockage detection system according to claim 2, characterized in that: The discharge pipe is connected with a clear liquid branch pipe and a cleaning water outlet branch pipe, wherein the clear liquid branch pipe is connected to the clear liquid outlet, and the cleaning water outlet branch pipe is connected to the cleaning water outlet.

4. A nozzle structure disc centrifuge blockage detection system according to claim 3, characterized in that: The material branch pipe, the cleaning water inlet branch pipe, the clear liquid branch pipe, and the cleaning water outlet branch pipe are all provided with control valves for pipeline switching.

5. The method for detecting blockage of a nozzle structure disc centrifuge according to claim 1, characterized in that: The material inlet flow meter data is collected to obtain the material feed flow rate, and the material outlet flow meter data is collected to obtain the clear liquid flow rate discharged from the centrifuge. The difference between the real-time collected material feed flow rate and the clear liquid flow rate is calculated and recorded as the real-time flow difference, and the real-time flow difference is compared with the normal flow difference for judgment.

6. A method for detecting blockage of a nozzle structure disc centrifuge according to claim 5, characterized in that: When the real-time flow rate of the clear liquid increases, the real-time flow difference decreases, and when the real-time flow difference is smaller than the normal flow difference, it is determined that the nozzle is clogged.

7. A nozzle structure disc centrifuge blockage detection system according to claim 5, characterized in that: If the calculated real-time flow difference is equal to the normal flow difference, the nozzle is judged to be normal.

8. The method for calculating the concentration multiple of a nozzle structure disc centrifuge according to claim 5, characterized in that: The following steps are involved: S1: Determine the concentrate outlet flow rate: Q 浓缩 =Q 进料 −Q 清液 S2: Determine the mass flow rate of a component in the stock solution: M 进料 =Q 进料 ×C 进料 S3: Determine the mass flow rate of a component in the concentrate: M 浓缩 =Q 浓缩 ×C 浓缩 S4: Due to material balance, the mass flow rate of a component in the raw liquid is equal to the mass flow rate of a component in the concentrate: M 浓缩 = M 进料 To find out the concentration of a component in a concentrate: S5: Calculate the concentration factor: 。

Images